Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine (1914)

Record Details:

Title:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine
Date:
1914
Author:
Gage, Simon Henry, 1851-1944
Publisher:
Ithaca, N.Y. : Comstock Publishing Company
Volume:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine
Leaf #:
00085
Language:
English
Subjects:
Lantern projection, Motion picture projection
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Bibliography: p. 693-703
Date Added:
July 19, 2022
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70 ALTERNATING AND DIRECT CURRENT LANTERNS [Cn. II But in installing a magic lantern for either current, it must never be forgotten that the arc lamp must not be connected with the main line without some form of rheostat or regulating device in the circuit (fig. 3, 40, and § 744}. FIG. 39. MAGIC LANTERN WITH INCLINED CARBONS. U C, L C The upper and the lower carbon. Only the carbons of the arc lamp are shown. A C Alternating current supply wires. F Fuses at the outlet box (see fig. 40). L Incandescent lamp for use in working around the magic lantern. S Double-pole, knife switch. R Rheostat in one wire. A Ammeter for indicating the amount of current. Condenser A two-lens condenser. The light is shown as a parallel beam between the lenses. It is usually diverging (see fig. i). L S Lantern slide next the condenser. Axis Axis The principal optic axis of the condenser and the projection objective. Objective The projection objective for forming the screen image. c Center of the projection objective. The objective and condenser should be so related that the light from the condenser crosses at the center when the image is in focus on the screen. Screen Image The image of the lantern slide on the screen. § 107. Double-pole table switch. — This is especially necessary when using an alternating current, because with it the current can be turned completely off the lamp whenever desired. Any changes in the carbons or in the lamp mechanism can then be made with safety, as the lamp is completely cut off from the electric supply, which would not be the case if a single-pole switch were used. The shock from an alternating ciirrent supply of no volts is much